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Search: id:A000251
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| A000251 |
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Number of trees of diameter 6.
(Formerly M2887 N1158)
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+0
1
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| 1, 3, 11, 29, 74, 167, 367, 755, 1515, 2931, 5551, 10263, 18677, 33409, 59024, 102984, 177915, 304458, 516939, 871180, 1458882, 2428548, 4021670, 6627515
(list; graph; listen)
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OFFSET
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7,2
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
J. Riordan, Enumeration of trees by height and diameter, IBM J. Res. Dev. 4 (1960), 473-478.
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LINKS
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Index entries for sequences related to trees
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CROSSREFS
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Sequence in context: A053845 A072610 A110954 this_sequence A159229 A122023 A009183
Adjacent sequences: A000248 A000249 A000250 this_sequence A000252 A000253 A000254
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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